Journal article
Search for excited leptons in e e- collisions at √s = 161 GeV
K Ackerstaff, G Alexander, J Allison, N Altekamp, K Ametewee, KJ Anderson, S Anderson, S Arcelli, S Asai, D Axen, G Azuelos, AH Ball, E Barberio, RJ Barlow, R Bartoldus, JR Batley, J Bechtluft, C Beeston, T Behnke, AN Bell Show all
Physics Letters Section B Nuclear Elementary Particle and High Energy Physics | ELSEVIER SCIENCE BV | Published : 1997
Abstract
We have searched for excited states of charged and neutral leptons, e*, μ*, τ* and ν*, in e+e- collisions at √s = 161 GeV using the OPAL detector at LEP. No evidence for their existence was found. With the most common coupling assumptions, the topologies from excited lepton pair production include ℓ+ℓ-γγ and ℓ+ℓ-W+W-, with the subsequent decay of the virtual W bosons. From the analysis of these topologies, 95% confidence level lower mass limits of 79.9 GeV for e*, 80.0 GeV for μ*, 79.1 GeV for τ*, 78.3 GeV for ν*e, 78.9 GeV for ν*μ and 76.2 GeV for ν*τ are inferred. From the analysis of W+W- and γγ topologies with missing energy and using alternative coupling assignments which favour charged..
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